<template>
    <div class="app-container">
        <!--课程表单-->
        <el-form :inline="true" class="demo-form-inline">
            <el-form-item>
                <el-input v-model="courseQuery.title" placeholder="课程名称"/>
            </el-form-item>

            <el-form-item>
                <el-select v-model="courseQuery.status" clearable placeholder="课程状态">
                <el-option :value="'Normal'" label="已发布"/>
                <el-option :value="'Draft'" label="未发布"/>
                </el-select>
            </el-form-item>

            <el-button type="primary" icon="el-icon-search" @click="getList()">查询</el-button>
            <el-button type="default" @click="resetData()">清空</el-button>
        </el-form>

        <!-- 表格 -->
        <el-table v-loading="listLoading" :data="list" 
            element-loading-text="数据加载中" border fit highlight-current-row>

            <el-table-column label="序号" width="70" align="center">
                <template slot-scope="scope">
                    {{ (page - 1) * limit + scope.$index + 1 }}
                </template>
            </el-table-column>

            <el-table-column prop="title" label="课程名称" align="center"/>

            <el-table-column label="课程状态" width="120" align="center">
                <template slot-scope="scope">
                    {{ scope.row.status==='Normal'?'已发布':'未发布' }}
                </template>
            </el-table-column>

            <el-table-column prop="lessonNum" label="课时数" align="center" width="100"/>

            <el-table-column prop="gmtCreate" label="添加时间" align="center" width="160"/>

            <el-table-column prop="viewCount" label="浏览数量" align="center" width="120"/>

            <el-table-column label="课程名称" align="center">
                <template slot-scope="scope">
                    <router-link :to="'/course/info/' + scope.row.id">
                        <el-button type="peimary" size="mini" icon="el-icon-edit">编辑课程基本信息</el-button>
                    </router-link>
                    <router-link :to="'/course/chapter/' + scope.row.id">
                        <el-button type="peimary" size="mini" icon="el-icon-edit">编辑课程大纲</el-button>
                    </router-link>
                    <el-button type="danger" size="mini" icon="el-icon-delete" @click="removeCourse(scope.row.id)">删除课程信息</el-button>
                </template>
            </el-table-column>

        </el-table>

        <!-- 分页 -->
        <el-pagination
            :current-page="page"
            :page-size="limit"
            :total="total"
            style="padding: 30px 0; text-align: center;"
            layout="total, prev, pager, next, jumper"
            @current-change="getList"
        />
    </div>
</template>

<script>
    //引入调用api 中 teacher.js文件
    import courseApi from '@/api/edu/course'

    export default {
        data() {    //定义变量和初始值
            return {
                listLoading: false,
                list: null, //查询之后接口返回集合
                page: 1,    //当前页
                limit: 5,  //每页记录数
                total: 0,   //总记录数
                courseQuery: { //条件封装对象
                    "title": '',
                    "status": ''
                }    
            }
        },
        created() { //页面渲染之前执行，一般调用methods定义的方法
            this.getList()  //调用
        },
        methods: {  //创建具体的方法，调用teacher.js定义的方法
            getList(page = 1) { //讲师列表的方法
                this.page = page
                courseApi.getTeacherListPage(this.page, this.limit, this.courseQuery )
                    .then(response => { //请求成功
                        //response 接口返回的数据
                        this.list = response.data.rows
                        this.total = response.data.total
                    })
            },
            resetData() {   //清空查询数据
                //清空输入项数据清空
                this.courseQuery = {}
                //查询所有信息
                this.getList();
            },
            removeCourse(courseId) {
                this.$confirm('此操作将永久删除该课程，以及该课程下的章节和视频，是否继续?', '提示', {
                    confirmButtonText: '确定',
                    cancelButtonText: '取消',
                    type: 'warning'
                })
                .then( () => {
                    courseApi.deleteCourse(courseId)
                        .then(response => {
                            //提示信息
                            this.$message({
                                type: 'success',
                                message: '删除成功!'
                            })
                            //回到界面
                            this.getList()
                        })
                })
            } 
        }
    }
</script>